Adamantium is a fictional metal, most famously appearing as an alloy in American comic books published by Marvel Comics. It is best known as the substance bonded to the character Wolverine's skeleton and claws. It also appears in the 1941 story "Devil's Powder" by Malcolm Jameson.
First mention in Marvel comics
It was first mentioned in Marvel Comics in a story scripted by writer Roy Thomas and drawn by Barry Windsor-Smith and Syd Shores in The Avengers #66 (July 1969). Here, it is part of supervillain Ultron's outer shell.[1] In the stories where it appears, the defining quality of adamantium is its indestructibility.[2]